Calendar



Sept. 21 1926. 7 1,600,874

.1. GREENWOOD ET AL CALENDAR Filed Sept. 22 I 1925 3 Sheets-Sheet 1 WITNESSES V INVENTORS ]6 l/7[ 8.5 6 Fella/00d 1 ATTORNEYS Sept. 21 [1926.

J. GRE ENWOOD ET AL CALENDAR Filed Sept. 22 1925 s Sheets-Sheet 2 [NYE @0165 (1/? ATTORNEYS WI TNESSES Sept. 21 192-6. 1,600,874

J. GREENWOOD ET AL CALENDAR Filed p 1925 5 Sheets- Sheet 5 Patented Sept. 21, 1926. l

Jeers QREENWQPD m mare E; w re o abm axis.

' cntmvnrm.

Application filed September 22, 1925 Serial No.,57,898.

This invention relates in general to an improvement in calendars and more particularly" to'f'an improvement in perpetual calendars. The'fobbct of I the invention is to provide a calendar of this character which has a wide range over the centuries and which may be readily and easily adj nsted to providea calendar for any particular period.

which willibe hereinafter more 'fully described and particularly pointed out in the appended. claims, re ferenceibeing hadto the f a'c'eompanyingfdrawings forming a part of this specification andln which: I

Figure *1 is a plan view showing a calendam-constructed inaccordance with the present invention, V 3o filTigure '2 is a view thereof in edge elevation," 'Figure 3 is a orday disc,

* Figure 4 s a similar view ofthe month disc Figure 5 is a plan View of. the'year disc, and Figure. 6 is a similar viewrof the century discs-" 4 3 -Referring to themlrawings it will be seen that, the 'present. invention proposes a d'ar'or day disc 1, 'anda year. isc '2, 'a century disc 3', and a'rnonth disc 410i suc- *cessively decreasing sizefBetween the discs- Ifandi2,a .blank 'or'cover disc 5 having a viewing opening 6. isiinterposed. Similar though. smaller blankor cover discs "Z and 8; having. viewingopenings 9 and" 10"re- 50. spectively are interposed between-thediscs 2. an d 3, and 3 and 4 respectively. Still another and; small disc )11 having a view 'OpeningIlQ is placed; on top of the disc The-"discs- 1" and 5' are moiinted atfltheir centers for independentretation one nivet eme ah Y to the. year 2000 with the exception of the- The discs 2, 3, 4, 6,7, 8 and 11 aremounted v q Q P I iG independent r t ti b a p vot pm 1 3 'fixed eccentrically to the hub 13. In this way while the discs 2, 3, 4, 6,

7, 8 and 11 are rotatable about the same axis they are eccentric with respect to discs 11 and 5 and this has the advantage of per-' mitting the" discs '1 and 5 to be smaller than they could 'be'if all of the discs were pivoted on the same axis.

The dlsc 1 asshown in Figure '3-has con- 'centric circles 14 and 15 applied thereto,"the circles being spaced inwardly from ,the

periphery of the disc and coacting with fhea vyintersecting radiallin'es' 1'6'to' provide f a circularserles 05E calendar'receivlng spaces 17 and heading receiving spaces '18, The heading spaces 18 -bear'"th word calendars and the key nurnbers 18 identifying the calendar in each particular space as will hereinafter more fully appear. Eachcalendar receiving space ha'slight radiall'lines l9 appliedthereto to 'defin'espacesor divisions adapted to receive columns of figures, each column of figures being headed by an abbreviation of the day of theweek of which the figures in the columns are "the dates.

As shown in Figure 5 the year disc2 has concentrlc circles or'cir'cular; lines 20 and 21,

and intersecting radialllines22, the "'circles and the periphery of thedisc defining inner plan view of the calendar and outer annular panels 23' and EZ l IQ PQcone to one hundred are placed and signify -years. Inthe spaces ofthe inner annular jpanel key numbers, accompanied suitable explanatory indi'cia, are placed, each year thus having a key number or' afactor of a key numberradially alined therewith. calendar comprising; generally alare'e calen- I in'Flgureb and has an arcuate-line 260a The century disc 3' is shown to advantage circular line 27 and radial lines 28 which coact with each other andwiththeperiphery of the disc to define an outer a'rcuate series number 1700' representative of thejeighta icentnry 31 along with certain explanatory indicia. The month disc 4. is shown in'detail 1n "Figure l and has concentric circular lines 7 32 and 83 and radial lines 34; applied thereto to define inner and outer circular series of spaces 85 and 86 respectively. In the space ,5 is also placed thereon. cover disc 5, the year disc 2 is placed and 35 abbreviations of the names of the months are placed and in the radially alined spaces 36 key numbers or factors of key numbers are applied 7 In assembling the discs, the calendar disc 1 is placed on its hub 13 and the cover disc On top of the is in turn covered by the blank or cover disc 7. The century disc 3 is applied to the cover disc 7 and on the disc 3 the blank or cover disc Sis placed. On the cover disc 8, the month disc t is arranged and the outer cover or blank disc 11 is applied on the vmonth disc l, the discs 2, 7,3, 8, 4 and 1.1

' being mounted on the pivot pin 13.

' .The calendar for any month of any year may be had by adjusting the month disc a:

' to bring the abbreviation of the desired 7 month and the key number factor into the view opening or window 12. The century disc 3 and the year disc 2 are similarly adjusted to bring the numbers corresponding to the century and year and their associated key number factors into their respective i 1 1400,1500,1e00,1700 and 2000) add six (6) to the sum of the key number factors to obtain the correct calendar key number.

In this way the correct "calendar for any month from the year one to'the year twenty.

one hundred A. D. may be obtained.

We claim:

1. A perpetual calendar comprising 'a calendar disc having concentric circular series of calendar receiving spaces and head- 1 ing receiving spaces, the calendar receiving spaces bearingjthe recurring monthly calendars, the heading recelvlng spaces bearing identifying key numbers forv the calendars,

a cover disc for the calendar discs having aviewing opening through which any one calendar may be seen, a year disc'having concentric series of spaces bearing numbers representing the years and key number factors respectively, a cover disc for the year disc having a viewing opening through ywhich any year number and its associated key number may be vviewed, a century disc having concentric arcuate series of spaces that is, 100, 200,300, 400,500,-

bearing numbers representing the centuries and key number factors, a cover disc for the century d scs having a vlewing opening through which anyone-of'the numbers f 2. A perpetual calendar comprising a calendar d1sc havmgcalendar receiving spaces and heading receiving spaces, thecalendar receiving spaces bearing the recurrmg monthly calendars,the heading receivmg spaces bearing identlfylng key numbers for the calendars, a cover disc for the calendar discs having a viewing opening through which any one calendar may be seen, a year disc having spaces bearing numbers representing the years and'key' number factors respectively, a cover disc for the year disc representing the months and key number factors, a cover disc for. the month disc having a viewing opening throughwhich any one month representing indicia and its key number factor may be viewed and means for pivoting the discs for independent ro tary movement. 1 i

3. A perpetual calendar comprising tabular means having a plurality of calendar receiving spaces and heading spaces bearing the complete and correct recurring monthly calendars and identifying-key numbers for the calendars respectively, a cover cooperable with the tabular means and having'a 'viewin opening of a size and shape topermit -o the viewing 'of any one complete and correct monthly calendar at a time, the other calendars being concealed from view by the cover, and cooperable tabular'means and covers, the cooperable tabular'means having spaces bearing mdicia representing years, centuries and months, each ofsuch indicia having associated therewith key number factors, the covers havlng viewing openings through which the underlying indicia may be viewed.

V 4. A perpetual calendar comprising tubular means having a plurality of calendar receiving spaces bearing the complete and correct recurring monthly calendars, there being one complete and correct monthly calendar in each of the plurality of calendar receiving spaces each monthly calendar having its numbers grouped in roWs to correspond to the Weeks of the month and rows to correspond to the days of the Week Whereby a normal and easily readable monthly calendaris always had, cooperabletabular; 10

means having spaces bearing indicia representing years, centuries and months said 7 tabular means and said cooperable tabular means having means identifying any of the 'calendars with any selected arrangement-of 1 l 

